# 课堂练习 钟奕升
import random
while 1:
    punches = ['石头', '剪刀', '布', 'end']
    computer_choice = 'end'
    while computer_choice == 'end':
         computer_choice = random.choice(punches)
    user_choice = input('请出拳：（石头 剪刀 布 end）')
    while user_choice not in punches:
        print("输入错误")
        user_choice=input()
    if user_choice=='end':
        break
    print('战斗过程')
    print('电脑出了：%s'% computer_choice)
    print('你出了：%s' % user_choice)
    print("结果")
    if user_choice==computer_choice:
        print('平局')
    elif(user_choice=='石头' and computer_choice=='剪刀')or(user_choice=='剪刀'and computer_choice=='布')or(user_choice=='布' and computer_choice=='石头'):
        print('你赢了')
    else:
        print('你输了')
print('你输了')
